Flash Flood Prediction Program

-	Message 1's have been issued for the entire District and will be valid until 10pm this evening.
-	Thunderstorms are expected to develop over the coming hours and will be capable of producing heavy rainfall later this afternoon and evening. Prime time for stronger thunderstorms is from 3-9pm. Thunderstorms will be slow moving and may result in extended periods of heavy rain that may lead to excessive runoff and possibly flash flooding.
-	Stronger storms today may favor areas S of I-70 and E of Hwy 85 as there has been more sunshine and more heating through early afternoon to fuel storms in this area.

STORM RAINFALL POTENTIAL AND DURATION: Rain showers and weak thunderstorms will produce 0.1-0.5" in 10-30 minutes. Moderate to strong thunderstorms will have the potential to produce 0.5-1.5" of heavy rain in 10-30 minutes.

WORST CASE SCENARIO: A stationary strong thunderstorm may result in up to 2.5" in 45-60 minutes.

County	Message	Valid Times	Prime Time
Broomfield County	1	Current TO 1000 PM	300 PM TO 900 PM
Lakewood	1	Current TO 1000 PM	300 PM TO 900 PM
Wheat Ridge	1	Current TO 1000 PM	300 PM TO 900 PM
Arvada	1	Current TO 1000 PM	300 PM TO 900 PM
the City of Aurora	1	Current TO 1000 PM	300 PM TO 900 PM
Arapahoe County	1	Current TO 1000 PM	300 PM TO 900 PM
DIA	1	Current TO 1000 PM	300 PM TO 900 PM
Denver County	1	Current TO 1000 PM	300 PM TO 900 PM
Adams County	1	Current TO 1000 PM	300 PM TO 900 PM
Douglas County	1	Current TO 1000 PM	300 PM TO 900 PM
Jefferson County	1	Current TO 1000 PM	300 PM TO 900 PM
Boulder County	1	Current TO 1000 PM	300 PM TO 900 PM

County-specific Quantitative Precipitation Outlook	Precipitation Time	30-Minute Rainfall and % Probability	Message Potential
Plains
Adams	300 PM TO 1000 PM	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Arapahoe	300 PM TO 1000 PM	0.1" (95%) to 0.5" (65%) to 1.5" (35%)	ISSUED
Broomfield	300 PM TO 1000 PM	0.1" (90%) to 0.5" (40%) to 1.5" (20%)	ISSUED
Denver	300 PM TO 1000 PM	0.1" (95%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Boulder	200 PM TO 1000 PM	0.1" (90%) to 0.5" (40%) to 1.5" (20%)	ISSUED
Douglas	200 PM TO 1000 PM	0.1" (100%) to 0.5" (65%) to 1.5" (35%)	ISSUED
Jefferson	200 PM TO 1000 PM	0.1" (90%) to 0.5" (50%) to 1.5" (25%)	ISSUED
Foothills above 6500ft
Boulder	100 PM TO 1000 PM	0.1" (90%) to 0.5" (40%) to 1.5" (20%)	ISSUED
Douglas	100 PM TO 1000 PM	0.1" (100%) to 0.5" (65%) to 1.5" (35%)	ISSUED
Jefferson	100 PM TO 1000 PM	0.1" (100%) to 0.5" (65%) to 1.5" (35%)	ISSUED

MONITOR NATIONAL WEATHER SERVICE FOR SEVERE WEATHER STATEMENTS.